Organic light emitting diode and organic light emitting device including the same

ABSTRACT

The present disclosure relates to an OLED that includes a first electrode; a second electrode facing the first electrode; a first emitting material layer including a first host, a second host and a blue dopant and positioned between the first and second electrodes; a first electron blocking layer including an electron blocking material of an amine derivative and positioned between the first electrode and the first emitting material layer; and a first hole blocking layer including at least one of a first hole blocking material and a second hole blocking material and positioned between the second electrode and the first emitting material layer, wherein the first host is an anthracene derivative, and the second host is a deuterated anthracene derivative, and wherein the first hole blocking material is an azine derivative, and the second hole blocking material is a benzimidazole derivative.

TECHNICAL FIELD

The present disclosure relates to an organic light emitting diode(OLED), and more specifically, to an OLED having enhanced emittingefficiency and lifespan and an organic light emitting device includingthe same.

BACKGROUND ART

As requests for a flat panel display device having a small occupied areahave been increased, an organic light emitting display device includingan OLED has been the subject of recent research and development.

The OLED emits light by injecting electrons from a cathode as anelectron injection electrode and holes from an anode as a hole injectionelectrode into an emitting material layer (EML), combining the electronswith the holes, generating an exciton, and transforming the exciton froman excited state to a ground state. A flexible substrate, for example, aplastic substrate, can be used as a base substrate where elements areformed. In addition, the organic light emitting display device can beoperated at a voltage (e.g., 10V or below) lower than a voltage requiredto operate other display devices. Moreover, the organic light emittingdisplay device has advantages in the power consumption and the colorsense.

The OLED includes a first electrode as an anode over a substrate, asecond electrode, which is spaced apart from and faces the firstelectrode, and an organic emitting layer therebetween.

For example, the organic light emitting display device may include a redpixel region, a green pixel region and a blue pixel region, and the OLEDmay be formed in each of the red, green and blue pixel regions.

However, the OLED in the blue pixel does not provide sufficient emittingefficiency and lifespan such that the organic light emitting displaydevice has a limitation in the emitting efficiency and the lifespan.

DISCLOSURE OF INVENTION Technical Problem

Accordingly, the present disclosure is directed to an OLED and anorganic light emitting device including the OLED that substantiallyobviate one or more of the problems due to the limitations anddisadvantages of the related art.

An object of the present disclosure is to provide an OLED havingenhanced emitting efficiency and lifespan and an organic light emittingdevice including the same.

Additional features and advantages of the disclosure will be set forthin the description which follows, and in part will be apparent from thedescription, or may be learned by practice of the disclosure. Theobjectives and other advantages of the disclosure will be realized andattained by the structure particularly pointed out in the writtendescription and claims hereof as well as the appended drawings.

Solution to Problem

According to an aspect, the present disclosure provides an OLED thatincludes a first electrode; a second electrode facing the firstelectrode; a first emitting material layer including a first host, asecond host and a blue dopant and positioned between the first andsecond electrodes; a first electron blocking layer including an electronblocking material of an amine derivative and positioned between thefirst electrode and the first emitting material layer; and a first holeblocking layer including at least one of a first hole blocking materialand a second hole blocking material and positioned between the secondelectrode and the first emitting material layer, wherein the first hostis an anthracene derivative, and the second host is a deuteratedanthracene derivative, and wherein the first hole blocking material isan azine derivative, and the second hole blocking material is abenzimidazole derivative.

As an example, in the first emitting material layer, a weight % ratio ofthe first host to the second host is 1:9 to 9:1.

As an example, in the first emitting material layer, the weight % ratioof the first host to the second host is 1:9 to 7:3.

As an example, in the first emitting material layer, the weight % ratioof the first host to the second host is 3:7.

As an example, in the first emitting material layer, the weight % ratioof the first host to the second host is 7:3.

The OLED may include a single emitting part or a tandem structure of amultiple emitting parts.

The tandem-structured OLED may emit blue color or white color.

According to another aspect, the present disclosure provides an organiclight emitting device comprising the OLED, as described above.

For example, the organic light emitting device may be an organic lightemitting display device or a lightening device.

It is to be understood that both the foregoing general description andthe following detailed description are examples and are explanatory andare intended to provide further explanation of the disclosure asclaimed.

Advantageous Effects of Invention

An emitting material layer of an OLED of the present disclosure includesa first host of an anthracene derivative and a second host of adeuterated anthracene derivative such that an emitting efficiency and alifespan of the OLED and an organic light emitting device including theOLED are improved.

In addition, an electron blocking layer of an OLED of the presentdisclosure includes an amine derivative as an electron blockingmaterial, and a hole blocking layer of the OLED includes at least one ofan azine derivative and a benzimidazole derivative as a hole blockingmaterial. Accordingly, the lifespan of the OLED and an organic lightemitting device is further improved.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure, are incorporated in and constitute apart of this specification, illustrate implementations of the disclosureand together with the description serve to explain the principles ofembodiments of the disclosure.

FIG. 1 is a schematic circuit diagram illustrating an organic lightemitting display device of the present disclosure.

FIG. 2 is a schematic cross-sectional view illustrating an organic lightemitting display device according to a first embodiment of the presentdisclosure.

FIG. 3 is a schematic cross-sectional view illustrating an OLED having asingle emitting part for the organic light emitting display deviceaccording to the first embodiment of the present disclosure.

FIG. 4 is a schematic cross-sectional view illustrating an OLED having atandem structure of two emitting parts according to the first embodimentof the present disclosure.

FIG. 5 is a schematic cross-sectional view illustrating an organic lightemitting display device according to a second embodiment of the presentdisclosure.

FIG. 6 is a schematic cross-sectional view illustrating an OLED for theorganic light emitting display device according to the second embodimentof the present disclosure.

FIG. 7 is a schematic cross-sectional view illustrating an organic lightemitting display device according to a third embodiment of the presentdisclosure.

MODE FOR THE INVENTION

Reference will now be made in detail to aspects of the disclosure,examples of which are illustrated in the accompanying drawings.

FIG. 1 is a schematic circuit diagram illustrating an organic lightemitting display device of the present disclosure.

As illustrated in FIG. 1, a gate line GL and a data line DL, which crosseach other to define a pixel (pixel region) P, and a power line PL areformed in an organic light display device. A switching thin filmtransistor (TFT) Ts, a driving TFT Td, a storage capacitor Cst and anOLED D are formed in the pixel region P. The pixel region P may includea red pixel, a green pixel and a blue pixel.

The switching thin film transistor Ts is connected to the gate line GLand the data line DL, and the driving thin film transistor Td and thestorage capacitor Cst are connected between the switching thin filmtransistor Ts and the power line PL. The OLED D is connected to thedriving thin film transistor Td. When the switching thin film transistorTs is turned on by the gate signal applied through the gate line GL, thedata signal applied through the data line DL is applied a gate electrodeof the driving thin film transistor Td and one electrode of the storagecapacitor Cst through the switching thin film transistor Ts.

The driving thin film transistor Td is turned on by the data signalapplied into the gate electrode so that a current proportional to thedata signal is supplied from the power line PL to the OLED D through thedriving thin film transistor Tr. The OLED D emits light having aluminance proportional to the current flowing through the driving thinfilm transistor Td. In this case, the storage capacitor Cst is chargewith a voltage proportional to the data signal so that the voltage ofthe gate electrode in the driving thin film transistor Td is keptconstant during one frame. Therefore, the organic light emitting displaydevice can display a desired image.

FIG. 2 is a schematic cross-sectional view illustrating an organic lightemitting display device according to a first embodiment of the presentdisclosure.

As illustrated in FIG. 2, the organic light emitting display device 100includes a substrate 110, a TFT Tr and an OLED D connected to the TFTTr. For example, the organic light emitting display device 100 mayinclude a red pixel, a green pixel and a blue pixel, and the OLED D maybe formed in each of the red, green and blue pixels. Namely, the OLEDs Demitting red light, green light and blue light may be provided in thered, green and blue pixels, respectively.

The substrate 110 may be a glass substrate or a plastic substrate. Forexample, the substrate 110 may be a polyimide substrate.

A buffer layer 120 is formed on the substrate, and the TFT Tr is formedon the buffer layer 120. The buffer layer 120 may be omitted.

A semiconductor layer 122 is formed on the buffer layer 120. Thesemiconductor layer 122 may include an oxide semiconductor material orpolycrystalline silicon.

When the semiconductor layer 122 includes the oxide semiconductormaterial, a light-shielding pattern (not shown) may be formed under thesemiconductor layer 122. The light to the semiconductor layer 122 isshielded or blocked by the light-shielding pattern such that thermaldegradation of the semiconductor layer 122 can be prevented. On theother hand, when the semiconductor layer 122 includes polycrystallinesilicon, impurities may be doped into both sides of the semiconductorlayer 122.

A gate insulating layer 124 is formed on the semiconductor layer 122.The gate insulating layer 124 may be formed of an inorganic insulatingmaterial such as silicon oxide or silicon nitride.

A gate electrode 130, which is formed of a conductive material, e.g.,metal, is formed on the gate insulating layer 124 to correspond to acenter of the semiconductor layer 122.

In FIG. 2, the gate insulating layer 124 is formed on an entire surfaceof the substrate 110. Alternatively, the gate insulating layer 124 maybe patterned to have the same shape as the gate electrode 130.

An interlayer insulating layer 132, which is formed of an insulatingmaterial, is formed on the gate electrode 130. The interlayer insulatinglayer 132 may be formed of an inorganic insulating material, e.g.,silicon oxide or silicon nitride, or an organic insulating material,e.g., benzocyclobutene or photo-acryl.

The interlayer insulating layer 132 includes first and second contactholes 134 and 136 exposing both sides of the semiconductor layer 122.The first and second contact holes 134 and 136 are positioned at bothsides of the gate electrode 130 to be spaced apart from the gateelectrode 130.

The first and second contact holes 134 and 136 are formed through thegate insulating layer 124. Alternatively, when the gate insulating layer124 is patterned to have the same shape as the gate electrode 130, thefirst and second contact holes 134 and 136 is formed only through theinterlayer insulating layer 132.

A source electrode 140 and a drain electrode 142, which are formed of aconductive material, e.g., metal, are formed on the interlayerinsulating layer 132.

The source electrode 140 and the drain electrode 142 are spaced apartfrom each other with respect to the gate electrode 130 and respectivelycontact both sides of the semiconductor layer 122 through the first andsecond contact holes 134 and 136.

The semiconductor layer 122, the gate electrode 130, the sourceelectrode 140 and the drain electrode 142 constitute the TFT Tr. The TFTTr serves as a driving element. Namely, the TFT Tr may correspond to thedriving TFT Td (of FIG. 1).

In the TFT Tr, the gate electrode 130, the source electrode 140, and thedrain electrode 142 are positioned over the semiconductor layer 122.Namely, the TFT Tr has a coplanar structure.

Alternatively, in the TFT Tr, the gate electrode may be positioned underthe semiconductor layer, and the source and drain electrodes may bepositioned over the semiconductor layer such that the TFT Tr may have aninverted staggered structure. In this instance, the semiconductor layermay include amorphous silicon.

Although not shown, the gate line and the data line cross each other todefine the pixel, and the switching TFT is formed to be connected to thegate and data lines. The switching TFT is connected to the TFT Tr as thedriving element.

In addition, the power line, which may be formed to be parallel to andspaced apart from one of the gate and data lines, and the storagecapacitor for maintaining the voltage of the gate electrode of the TFTTr in one frame may be further formed.

A passivation layer 150, which includes a drain contact hole 152exposing the drain electrode 142 of the TFT Tr, is formed to cover theTFT Tr.

A first electrode 160, which is connected to the drain electrode 142 ofthe TFT Tr through the drain contact hole 152, is separately formed ineach pixel. The first electrode 160 may be an anode and may be formed ofa conductive material having a relatively high work function. Forexample, the first electrode 160 may be formed of a transparentconductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide(IZO).

When the OLED device 100 is operated in a top-emission type, areflection electrode or a reflection layer may be formed under the firstelectrode 160. For example, the reflection electrode or the reflectionlayer may be formed of aluminum-palladium-copper (APC) alloy.

A bank layer 166 is formed on the passivation layer 150 to cover an edgeof the first electrode 160. Namely, the bank layer 166 is positioned ata boundary of the pixel and exposes a center of the first electrode 160in the pixel.

An organic emitting layer 162 is formed on the first electrode 160. Theorganic emitting layer 162 may have a single-layered structure of anemitting material layer including an emitting material. To increase anemitting efficiency of the OLED D and/or the organic light emittingdisplay device 100, the organic emitting layer 162 may have amulti-layered structure. For example, the organic emitting layer 162 mayinclude the EML, an electron blocking layer (EBL) between the firstelectrode 160 and the EML, and a hole blocking layer (HBL) between theEML and the second electrode 164.

The organic emitting layer 162 is separated in each of the red, greenand blue pixels. As illustrated below, the organic emitting layer 162 inthe blue pixel includes a first host of an anthracene derivative(compound) and a second host of a deuterated anthracene derivative suchthat the emitting efficiency and the lifespan of the OLED D in the bluepixel are improved.

In addition, the EBL includes an amine derivative as an electronblocking material, and the HBL includes at least one of an azinederivative and a benzimidazole derivative as a hole blocking material.Accordingly, the lifespan of the OLED D and an organic light emittingdevice 100 is further improved.

A second electrode 164 is formed over the substrate 110 where theorganic emitting layer 162 is formed. The second electrode 164 covers anentire surface of the display area and may be formed of a conductivematerial having a relatively low work function to serve as a cathode.For example, the second electrode 164 may be formed of aluminum (Al),magnesium (Mg) or Al—Mg alloy.

The first electrode 160, the organic emitting layer 162 and the secondelectrode 164 constitute the OLED D.

An encapsulation film 170 is formed on the second electrode 164 toprevent penetration of moisture into the OLED D. The encapsulation film170 includes a first inorganic insulating layer 172, an organicinsulating layer 174 and a second inorganic insulating layer 176sequentially stacked, but it is not limited thereto. The encapsulationfilm 170 may be omitted.

A polarization plate (not shown) for reducing an ambient lightreflection may be disposed over the top-emission type OLED D. Forexample, the polarization plate may be a circular polarization plate.

In addition, a cover window (not shown) may be attached to theencapsulation film 170 or the polarization plate. In this instance, thesubstrate 110 and the cover window have a flexible property such that aflexible display device may be provided.

FIG. 3 is a schematic cross-sectional view illustrating an OLED having asingle emitting unit for the organic light emitting display deviceaccording to the first embodiment of the present disclosure.

As illustrated in FIG. 3, the OLED D includes the first and secondelectrodes 160 and 164, which face each other, and the organic emittinglayer 162 therebetween. The organic emitting layer 162 includes an EML240 between the first and second electrodes 160 and 164, an EBL 230between the first electrode 160 and the EML 240, and an HBL 250 betweenthe EML 240 and the second electrode 164.

The first electrode 160 may be formed of a conductive material having arelatively high work function to serve as an anode. The second electrode164 may be formed of a conductive material having a relatively low workfunction to serve as a cathode.

The organic emitting layer 162 may further include a hole transportinglayer (HTL) 220 between the first electrode 160 and the EBL 230.

Moreover, the organic emitting layer 162 may further include a holeinjection layer (HIL) 210 between the first electrode 160 and the HTL220 and an electron injection layer (EIL) 260 between the secondelectrode 164 and the HBL 250.

The EML 240 includes a first host 242 of an anthracene derivative, asecond host 244 of a deuterated anthracene derivative and a blue dopant(not shown) and provides blue emission.

The compound of the first host 242 may be represented by Formula 1:

In Formula 1, each of R₁ and R₂ is independently C₆˜C₃₀ aryl group orC₅˜C₃₀ heteroaryl group, and each of L₁ and L₂ is independently C₆˜C₃₀arylene group. Each of a and b is an integer of 0 or 1, and at least oneof a and b is 0.

For example, R₁ may be phenyl or naphthyl, R₂ may be naphthyl,dibenzofuranyl or fused dibenzofuranyl. Each of L₁ and L₂ mayindependently be phenylene.

In an exemplary embodiment, the first host 242 may be a compound beingone of the followings in Formula 2:

The second host 244 may be a deuterated compound of the first host 242.Namely, a hydrogen atom of the first host 242 may be substituted by adeuterium atom to form the second host 244. A part or all of thehydrogen atoms of the compound of the first host 242 may be substitutedby the deuterium atom.

For example, the compound of the second host 244 may be represented byFormula 3:

In Formula 3, the definition of R₁, R₂, L₁, L₂, a and be is same asFormula 1. In Formula 3, Dx, Dy, Dm and Dn denote a number of thedeuterium atom, and each of x, y, m and n is independently a positiveinteger. For example, a summation of x, y, m and n may be 15 to 29.

In an exemplary embodiment, the second host 244 of Formula 3 may be acompound being one of the followings in Formula 4:

A compound of the blue dopant may be represented by Formula 5-1 orFormula 5-2, but it is not limited thereto.

In Formula 5-1, each of c and d is independently an integer of 0 to 4,and e is an integer of 0 to 3. Each of R₁₁ and R₁₂ is independentlyselected from the group consisting of C₁˜C₂₀ alkyl group, C₆˜C₃₀ arylgroup, C₅˜C₃₀ hetero aryl group and C₆˜C₃₀ aryl amino group, or adjacenttwo among R₁₁ or adjacent two among R₁₂ form a fused aromatic ring or ahetero-aromatic ring. R₁₃ is selected from the group consisting ofC₁˜C₁₀ alkyl group, C₆˜C₃₀ aryl group, C₅˜C₃₀ hetero aryl group andC₅˜C₃₀ aromatic amino group. Each of X₁ and X₂ is independently oxygen(O) or NR₁₄, and R₁₄ is C₆˜C₃₀ aryl group.

In Formula 5-2, each of Ar₁, Ar₂, Ar₃ and Ar₄ is independently selectedfrom the group consisting of C₆˜C₃₀ aryl group and C₅˜C₃₀ hetero arylgroup, and each of R₁ and R₂ is independently selected from the groupconsisting of hydrogen, C₁˜C₂₀ alkyl group and C₆˜C₃₀ aryl group. Forexample, each of Ar₁, Ar₂, Ar₃ and Ar₄ may be independently selectedfrom the group consisting of phenyl, dibenzofuranyl, naphthyl andbiphenyl and may be substituted by trifluoromethyl, cyano or fluorine(F). Each of R₁ and R₂ may be independently selected from the groupconsisting of hydrogen, isopropyl and phenyl.

For example, the blue dopant in Formula 5-1 may be a compound being oneof the followings in Formula 6-1:

For example, the blue dopant of Formula 5-2 may be a compound being oneof the followings in Formula 6-2:

The EBL 230 includes an amine derivative as an electron blockingmaterial. The material of the EBL 230 may be represented by Formula 7:

In Formula 7, each of R₁, R₂, R₃ and R₄ is independently selected fromthe group consisting of monocyclic aryl group or polycyclic aryl group,and at least one of R₁, R₂, R₃ and R₄ is polycyclic aryl group. Forexample, two of R₁, R₂, R₃ and R₄ may be polycyclic aryl group. Themonocyclic aryl group may be phenyl, and the polycyclic aryl group maybe a fused-aryl group. The polycyclic aryl group may be an aryl group inwhich at least two phenyl groups are fused.

The electron blocking material of Formula 7 may be one of the followingsof Formula 8:

The HBL 250 may include an azine derivative as a hole blocking material.For example, the material of the HBL 250 may be represented by Formula9:

In Formula 9, each of Y₁ to Y₅ are independently CR₁ or N, and one tothree of Y₁ to Y₅ is N. R₁ is independently hydrogen or C₆˜C₃₀ arylgroup. L is C₆˜C₃₀ arylene group, and R₂ is C₆˜C₃₀ aryl group or C₅˜C₃₀hetero aryl group. R₃ is hydrogen, or adjacent two of R3 form a fusedring. “a” is 0 or 1, “b” is 1 or 2, and “c” is an integer of 0 to 4.

The hole blocking material of Formula 9 may be one of the followings ofFormula 10:

Alternatively, the HBL 250 may include a benzimidazole derivative as ahole blocking material. For example, the material of the HBL 250 may berepresented by Formula 11:

In Formula 11, Ar is C₁₀˜C₃₀ arylene group, R₁ is C₆˜C₃₀ aryl group orC₅˜C₃₀ hetero aryl group, and R₂ is C₁˜C₁₀ alkyl group or C₆˜C₃₀ arylgroup.

For example, Ar may benaphthylene or anthracenylene, R₁ may bebenzimidazole or phenyl, and R₂ may be methyl, ethyl or phenyl.

The hole blocking material of Formula 11 may be one of the followings ofFormula 12:

The HBL 250 may include one of the hole blocking material of Formula 9and the hole blocking material of Formula 11.

In this instance, a thickness of the EML 240 may be greater than each ofa thickness of the EBL 230 and a thickness of the HBL 250 and may besmaller than a thickness of the HTL 220. For example, the EML may have athickness of about 150 to 250 Å, and each of the EBL 230 and the HBL 250may have a thickness of about 50 to 150 Å. The HTL 220 may have athickness of about 900 to 1100 Å. The EBL 230 and the HBL 250 may havethe same thickness.

The HBL 250 may include both the hole blocking material of Formula 9 andthe hole blocking material of Formula 11. For example, in the HBL 250,hole blocking material of Formula 9 and the hole blocking material ofFormula 11 may have the same weight %.

In this instance, a thickness of the EML 240 may be greater than athickness of the EBL 230 and may be smaller than a thickness of the HBL250. In addition, the thickness of HBL 250 may be smaller than athickness of the HTL 220. For example, the EML may have a thickness ofabout 200 to 300 Å, and the EBL 230 may have a thickness of about 50 to150 Å. The HBL 250 may have a thickness of about 250 to 350 Å, and theHTL 220 may have a thickness of about 800 to 1000 Å.

The hole blocking material of Formula 9 and/or the hole blockingmaterial of Formula 11 have an electron transporting property such thatan electron transporting layer may be omitted. As a result, the HBL 250directly contacts the EIL 260 or the second electrode 164 without theEIL 260.

In the OLED D of the present disclosure, a weight % ratio of the firsthost 242 to the second host 244 may be about 1:9 to about 9:1,preferably about 1:9 to about 7:3. To provide sufficient emittingefficiency and lifespan of the OLED D and the organic light emittingdisplay device, the weight % ratio of the first host 242 to the secondhost 244 may be about 3:7. On the other hand, to increase the lifespanwithout decrease of the emitting efficiency, the weight % ratio of thefirst host 242 to the second host 244 may be about 7:3. The OLED D andthe organic light emitting display device of the present disclosure haveadvantages in the emitting efficiency and the lifespan.

In addition, when the EML 240 includes the blue dopant of Formula 5-1,an image with narrow full width at half maximum (FWHM) and high colorpurity is provided.

Moreover, the EBL 230 includes an amine derivative as an electronblocking material, and the HBL 250 includes at least one of an azinederivative and a benzimidazole derivative as a hole blocking material.Accordingly, the lifespan of the OLED D and an organic light emittingdevice 100 is further improved.

[Synthesis of the First Host]

1. Synthesis of the Compound Host1

10-bromo-9-(naphthalene-3-yl)-anthracene (2.00 g, 5.23 mmol),4,4,5,5-tetramethyl-2-(naphthlen-1-yl)-1,3,2-dioxaborolane (1.45 g, 5.74mmol), tris (dibenzylideneacetone)dipalladium(0) (Pd₂(dba)₃) (0.24 g,0.26 mmol) and toluene (50 mL) were added into the flask (250 mL) in thedry box. The reaction flask was removed from the dry box, and sodiumcarbonate anhydride (20 mL, 2M) was added into the flask. The reactantswere stirred and heated at 90° C. overnight with monitoring the reactionby HPLC (high-performance liquid chromatography). The reaction flask wascooled down to the room temperature, and then an organic layer wasseparated from an aqueous layer. The aqueous layer was washed withdichloromethane (DCM), and the organic layer was concentrated with therotary vaporizer to obtain a gray powder. The gray power was purifiedwith alumina, precipitated with hexane and performed columnchromatography using silica gel to obtain the compound Host1 of whitepowder (2.00 g, yield: 89%).

2. Synthesis of the Compound Host2

10-bromo-9-(naphthalene-3-yl)-anthracene (2.00 g, 5.23 mmol),4,4,5,5-tetramethyl-2-(4-(naphthlen-4-yl)phenyl)-1,3,2-dioxaborolane(1.90 g, 5.74 mmol), Pd₂(dba)₃) (0.24 g, 0.26 mmol) and toluene (50 mL)were added into the flask (250 mL) in the dry box. The reaction flaskwas removed from the dry box, and sodium carbonate anhydride (20 mL, 2M)was added into the flask. The reactants were stirred and heated at 90°C. overnight with monitoring the reaction by HPLC. The reaction flaskwas cooled down to the room temperature and then an organic layer wasseparated from an aqueous layer. The aqueous layer was washed withdichloromethane (DCM) twice and the organic layer was concentrated withthe rotary vaporizer to obtain a gray powder. The gray power waspurified with alumina, precipitated with hexane and performed columnchromatography using silica gel to obtain the compound Host2 of whitepowder (2.28 g, yield: 86%).

3. Synthesis of the Compound Host3

10-bromo-9-(naphthalene-3-yl)-anthracene (2.00 g, 5.23 mmol),4,4,5,5-tetramethyl-2-(dibenzofuran-1-yl)-1,3,2-dioxaborolane (1.69 g,5.74 mmol), Pd₂(dba)₃) (0.24 g, 0.26 mmol) and toluene (50 mL) wereadded into the flask (250 mL) in the dry box. The reaction flask wasremoved from the dry box, and sodium carbonate anhydride (20 mL, 2M) wasadded into the flask. The reactants were stirred and heated at 90° C.overnight with monitoring the reaction by HPLC. The reaction flask wascooled down to the room temperature and then an organic layer wasseparated from an aqueous layer. The aqueous layer was washed withdichloromethane (DCM) twice and the organic layer was concentrated withthe rotary vaporizer to obtain a gray powder. The gray power waspurified with alumina, precipitated with hexane and performed columnchromatography using silica gel to obtain the compound Host3 of whitepowder (1.91 g, yield: 78%).

4. Synthesis of the Compound Host4

10-bromo-9-(naphthalene-3-yl)-anthracene (2.00 g, 5.23 mmol),4,4,5,5-tetramethyl-2-(dibenzofuran-1-yl)phenyl-1,3,2-dioxaborolane(2.12 g, 5.74 mmol), Pd₂(dba)₃) (0.24 g, 0.26 mmol) and toluene (50 mL)were added into the flask (250 mL) in the dry box. The reaction flaskwas removed from the dry box, and sodium carbonate anhydride (20 mL, 2M)was added into the flask. The reactants were stirred and heated at 90°C. overnight with monitoring the reaction by HPLC. The reaction flaskwas cooled down to the room temperature and then an organic layer wasseparated from an aqueous layer. The aqueous layer was washed withdichloromethane (DCM) twice and the organic layer was concentrated withthe rotary vaporizer to obtain a gray powder. The gray power waspurified with alumina, precipitated with hexane and performed columnchromatography using silica gel to obtain the compound Host4 of whitepowder (2.31 g, yield: 82%).

[Synthesis of the Second Host]

1. Synthesis of the Compound Host32

Under N₂ condition, AlCl₃ (0.48 g, 3.6 mmol) was added toperdeuterobenzene solution (100 mL) in which the compound Host2 (5 g,9.87 mmol) was dissolved. The mixture was stirred under the roomtemperature for 6 hrs, and D₂O (50 mL) was added. After separating theaqueous layer and the organic layer, the aqueous layer was washed withCH₂Cl₂ (30 mL). The obtained organic layer was dried using magnesiumsulfate, and the volatiles were removed by rotary evaporation. The crudeproduct was purified by column chromatography to obtain the compoundHost32 (4.5 g) of white powder.

2. Synthesis of the Compound Host34

Under N₂ condition, AlCl₃ (0.48 g, 3.6 mmol) was added toperdeuterobenzene solution (100 mL) in which the compound Host4 (5 g,9.15 mmol) was dissolved. The mixture was stirred under the roomtemperature for 6 hrs, and D₂O (50 mL) was added. After separating theaqueous layer and the organic layer, the aqueous layer was washed withCH₂Cl₂ (30 mL). The obtained organic layer was dried using magnesiumsulfate, and the volatiles were removed by rotary evaporation. The crudeproduct was purified by column chromatography to obtain the compoundHost34 (4.8 g) of white powder.

[Synthesis of the Blue Dopant]

1. Synthesis of the Compound Dopant56

(1) 3-nitro-N, N-diphenylaniline

Under N₂ condition, the flask containing 3-nitroaniline (25.0 g), iodidebenzene (81.0 g), copper iodide (3.5 g), potassium carbonate (100.0 g)and orthodichlorobenzene (250 mL) was heated and stirred for 14 hours.The reaction solution was cooled to the room temperature, and ammoniawater was added for liquid separation. The resultant was purified bysilica gel column chromatography (developing solution:toluene/heptane=3/7 (volume ratio)) to obtain 3-nitro-N,N-diphenylaniline (44.0 g).

(2) N1,N1-diphenylbenzene-1,3-diamine

Under N₂ condition, acetic acid cooled in the ice-bath was added andstirred. 3-nitro-N,N-diphenylaniline (44.0 g) was dropped into thesolution to avoid significant increase the reaction temperature. Afterthe addition was completed, the mixture was stirred at the roomtemperature for 30 minutes, and the disappearance of the startingmaterials was checked. After the reaction was completed, a supernatantliquid was collected by decantation, neutralized with sodium carbonate,and extracted with ethyl acetate. The resultant was purified by silicagel column chromatography (developing solution: toluene/heptane=9/1(volume ratio)). After removing the solvent by distillation underreduced pressure, heptane was added and reprecipitated to obtainN1,N1-diphenylbenzene-1,3-diamine (36.0 g).

(3) N1,N1,N3-triphenylbenzene-1,3-diamine

Under N₂ condition, the flask containingN1,N1-diphenylbenzene-1,3-diamine (60.0 g), Pd-132 (1.3 g), NaOtBu (33.5g) and xylene (300 mL) was stirred by heating at 120° C. The solution ofxylene (50 ml), in which bromobenzene (36.2 g) was dissolved, was slowlydropped to the solution, and the mixture was heated and stirred for 1hour after completion of dropping. After cooling the mixture to the roomtemperature, water and ethyl acetate were added for liquid separation.The resultant was purified by silica gel column chromatography(developing solution: toluene/heptane=5/5 (volume ratio)) to obtainN1,N1,N3-triphenylbenzene-1,3-diamine (73.0 g).

(4)N1,N1′-(2-chloro-1,3-phenylene)bis(N1,N3,N3-triphenylbenzene-1,3-diamine)

Under N₂ condition, the flask containingN1,N1,N3-triphenylbenzene-1,3-diamine (20.0 g),1-bromo-2,3-dichlorobenzene (6.4 g), Pd-132 (0.2 g), NaOtBu (sodiumtert-buthoxide, 6.8 g) and xylene (70 mL) was heated and stirred at 120°C. for 2 hrs. After cooling the mixture to the room temperature, waterand ethyl acetate were added for liquid separation. The resultant waspurified by silica gel column chromatography (developing solution:toluene/heptane=4/6 (volume ratio)) to obtainN1,N1′-(2-chloro-1,3-phenylene)bis(N1,N3,N3-triphenylbenzene-1,3-diamine)(15.0 g).

(5) Dopant56

1.7 M tert-butyllithium pentane solution (18.1 ml) was added into theflask containingN1,N1′-(2-chloro-1,3-phenylene)bis(N1,N,N3-triphenylbenzene-1,3-diamine)(12.0 g) and tert-butylbenzene (100 mL) with cooling in the ice bathunder N₂ condition. After heating up to 60° C. and stirring for 2 hrs,the component having boiling point lower than tert-butylbenzene wasdistilled off under reduced pressure. The mixture was cooled to −50° C.,and boron tribromide (2.9 mL) was added. The mixture was heated up tothe room temperature and stirred for 0.5 hour. The mixture was cooledagain in the ice bath, and N,N-diisopropylethylamine (5.4 mL) was added.The mixture was stirred at the room temperature until the exotherm wasfinished. The mixture was heated to the temperature of 120° C. andstirred for 3 hrs. The solution was cooled to the room temperature, andan aqueous sodium acetate solution, which was cooled in the ice bath,and ethyl acetate was sequentially added to the solution. The insolublesolid was filtered and phase-separated. Then, the residue was purifiedby silica gel column chromatography (developing solution:toluene/heptane=5/5 (volume ratio)). The mixture was washed with heatedheptane and ethyl acetate, and then reprecipitated with a mixed solventof toluene and ethyl acetate to obtain Dopant56 (2.0 g).

2. Synthesis of the Compound Dopant167

(1) 3,3″-((2-bromo-1,3-phenylene)bis(oxy)) di-1,1′-biphenyl

Under N₂ condition, the flask containing 2-bromo-1,3-difluorobenzene(12.0 g), [1,1′-biphenyl]-3-ol (23.0 g), potassium carbonate (34.0 g)and NMP (130 mL) was heated and stirred at 170° C. for 10 hrs. After thereaction was stopped, the reaction solution was cooled to the roomtemperature, and water and toluene were added for liquid separation. Thesolvent was distilled off under reduced pressure, and the resultant waspurified by silica gel column chromatography (developing solution:heptane/toluene=7/3 (volume ratio)) to obtain3,3″-((2-bromo-1,3-phenylene)bis(oxy)) di-1,1′-biphenyl (26.8 g) wasobtained.

(2) Dopant167

Under N₂ condition, the flask containing3,3″-((2-bromo-1,3-phenylene)bis(oxy))di-1,1′-biphenyl (14.0 g) andxylene (100 mL) was cooled to −40° C., and n-butyllithium hexanesolution (2.6 M, 11.5 mL) was dropped. After heating the mixture to theroom temperature, the mixture was cooled again to −40° C., and borontribromide (3.3 mL) was added thereto. The mixture was heated to theroom temperature and stirred for 13 hrs. The mixture was cooled to 0°C., and N,N-diisopropylethylamine (9.7 ml) was added. The mixture washeated and stirred at 130° C. for 5 hrs. The reaction solution wascooled to the room temperature, and an aqueous sodium acetate solutioncooled in the ice bath was added and stirred. The precipitated solid wascollected by suction filtration. The obtained solid was washed withwater, methanol and heptane in that order and recrystallized fromchlorobenzene to obtain the compound Dopant167 (8.9 g).

[Organic Light Emitting Diode]

The anode (ITO, 50 Å), the HIL (Formula 13 (97 wt %) and Formula 14 (3wt %), 100 Å), the HTL (Formula 13, 1000 Å), the EBL (Formula 15, 100Å), the EML (host (98 wt %) and dopant (2 wt %), 200 Å), the HBL(Formula 16, 100 Å), the EIL (Formula 17 (98 wt %) and Li (2 wt %), 200Å) and the cathode (Al, 500 Å) was sequentially deposited to form theOLED.

1. COMPARATIVE EXAMPLES (1) Comparative Example 1 (Ref1)

The compound “Dopant56” in Formula 6-1 is used as the dopant, and thecompound “Host2” is used as the host.

(2) Comparative Example 2 (Ref2)

The compound “Dopant1” in Formula 6-2 is used instead of the compound“Dopant56” in Formula 6-1 of Comparative Example 1.

(3) Comparative Example 3 (Ref3)

The compound “Host4” is used instead of the compound “Host2” ofComparative Example 1.

(4) Comparative Example 4 (Ref4)

The compound “Host4” is used instead of the compound “Host2” ofComparative Example 2.

(5) Comparative Example 5 (Ref5)

The compound “Host32” is used instead of the compound “Host2” ofComparative Example 1.

(6) Comparative Example 6 (Ref6)

The compound “Host32” is used instead of the compound “Host2” ofComparative Example 2.

(7) Comparative Example 7 (Ref7)

The compound “Host34” is used instead of the compound “Host2” ofComparative Example 1.

(8) Comparative Example 8 (Ref8)

The compound “Host34” is used instead of the compound “Host2” ofComparative Example 2.

2. EXAMPLES (1) Example 1 (Ex1)

The compound “Dopant56” in Formula 6-1 is used as the dopant, and thecompound “Host2” and the compound “Host32” are used as the host.(“Host2”:“Host32”=9:1 (wt % ratio))

(2) Example 2 (Ex2)

The weight % ratio of “Host2” to “Host32” is changed into 7:3 fromExample 1. (“Host2”:“Host32”=7:3 (wt % ratio))

(3) Example 3 (Ex3)

The weight % ratio of “Host2” to “Host32” is changed into 5:5 fromExample 1. (“Host2”:“Host32”=5:5 (wt % ratio))

(4) Example 4 (Ex4)

The weight % ratio of “Host2” to “Host32” is changed into 3:7 fromExample 1. (“Host2”:“Host32”=3:7 (wt % ratio))

(5) Example 5 (Ex5)

The weight % ratio of “Host2” to “Host32” is changed into 1:9 fromExample 1. (“Host2”:“Host32”=1:9 (wt % ratio))

(6) Examples 6 to 10 (Ex6 to Ex10)

The compound “Dopant1” in Formula 6-2 is used instead of the compound“Dopant56” in Examples 1 to 5.

(7) Example 11 (Ex11)

The compound “Dopant56” in Formula 6-1 is used as the dopant, and thecompound “Host4” and the compound “Host34” are used as the host.(“Host4”:“Host34”=9:1 (wt % ratio))

(8) Example 12 (Ex12)

The weight % ratio of “Host4” to “Host34” is changed into 7:3 fromExample 11. (“Host4”:“Host34”=7:3 (wt % ratio))

(9) Example 13 (Ex13)

The weight % ratio of “Host4” to “Host34” is changed into 5:5 fromExample 11. (“Host4”:“Host34”=5:5 (wt % ratio))

(10) Example 14 (Ex14)

The weight % ratio of “Host4” to “Host34” is changed into 3:7 fromExample 11. (“Host4”:“Host34”=3:7 (wt % ratio))

(11) Example 15 (Ex15)

The weight % ratio of “Host4” to “Host34” is changed into 1:9 fromExample 11. (“Host4”:“Host34”=1:9 (wt % ratio))

(16) Examples 16 to 20 (Ex16 to Ex20)

The compound “Dopant1” in Formula 6-2 is used instead of the compound“Dopant56” in Examples 11 to 15.

The properties, i.e., voltage (V), efficiency (Cd/A), color coordinate(CIE), FWHM and lifespan (T95), of the OLEDs manufactured in ComparativeExamples 1 to 8 and Examples 1 to 20 are measured and listed in Tables 1to 4.

TABLE 1 Host ratio 1st 2nd CIE FWHM T95 host host V Cd/A x y [nm] [hr]Ref1 10  0 3.77 4.78 0.1390 0.0612 26 153 Ex1  9  1 3.77 4.78 0.13900.0612 26 168 Ex2  7  3 3.77 4.78 0.1390 0.0611 26 184 Ex3  5  5 3.784.73 0.1391 0.0610 26 214 Ex4  3  7 3.78 4.68 0.1392 0.0610 26 275 Ex5 1  9 3.78 4.59 0.1393 0.0605 26 298 Ref5  0 10 3.78 4.55 0.1393 0.060526 302

TABLE 2 Host ratio 1st 2nd CIE FWHM T95 host host V Cd/A x y [nm] [hr]Ref2 10  0 3.77 6.91 0.1379 0.0974 40 221 Ex6  9  1 3.77 6.91 0.13790.0974 40 243 Ex7  7  3 3.77 6.91 0.1379 0.0973 40 265 Ex8  5  5 3.786.84 0.1380 0.0972 40 309 Ex9  3  7 3.78 6.77 0.1381 0.0972 40 398 Ex10 1  9 3.78 6.63 0.1382 0.0965 40 431 Ref6  0 10 3.78 6.56 0.1382 0.096540 435

TABLE 3 Host ratio 1st 2nd CIE FWHM T95 host host V Cd/A x y [nm] [hr]Ref3 10  0 3.92 4.98 0.1378 0.0632 26 141 Ex11  9  1 3.92 4.98 0.13780.0632 26 155 Ex12  7  3 3.92 4.98 0.1378 0.0631 26 169 Ex13  5  5 3.934.93 0.1379 0.0630 26 197 Ex14  3  7 3.93 4.88 0.1380 0.0630 26 253 Ex15 1  9 3.93 4.79 0.1381 0.0625 26 274 Ref7  0 10 3.93 4.75 0.1381 0.062526 278

TABLE 4 Host ratio 1st 2nd CIE FWHM T95 host host V Cd/A x y [nm] [hr]Ref4 10  0 3.92 7.11 0.1367 0.0994 40 203 Ex16  9  1 3.92 7.11 0.13670.0994 40 224 Ex17  7  3 3.92 7.11 0.1367 0.0993 40 244 Ex18  5  5 3.937.04 0.1368 0.0992 40 284 Ex19  3  7 3.93 6.97 0.1369 0.0992 40 366 Ex20 1  9 3.93 6.83 0.1370 0.0985 40 397 Ref8  0 10 3.93 6.76 0.1370 0.098540 400

As shown in Tables 1 to 4, the lifespan of the OLED in Examples 1 to 20using the first host, which is an anthracene derivative non-substitutedwith deuterium, and the second host, which is an anthracene derivativesubstituted with deuterium, is significantly increased in comparison tothe OLED in Comparative Examples 1 to 4 using the first host without thesecond host.

In addition, in comparison to the OLED in Comparative Examples 5 to 8using the second host without the first host, the lifespan of the OLEDin Examples 5, 10, 15 and 20 is slightly decreased, but the emittingefficiency of the OLED in Examples 5, 10, 15 and 20 is improved.

Accordingly, in the OLED of the present disclosure, a weight % ratio ofthe first host to the second host may be about 1:9 to 7:3. To providesufficient emitting efficiency and lifespan of the OLED and the organiclight emitting display device, the weight % ratio of the first host tothe second host may be about 3:7. On the other hand, to increase thelifespan without decrease of the emitting efficiency, the weight % ratioof the first host to the second host may be about 7:3.

In the OLED D of the present disclosure, the EML 240 includes anthracenederivative as the first host 242 and deuterated anthracene derivative asthe second host 244 such that the OLED D and the organic light emittingdisplay device 100 has advantages in the emitting efficiency and thelifespan.

The anode (ITO, 50 Å), the HIL (Formula 18 (97 wt %) and Formula 14 (3wt %), 100 Å), the HTL (Formula 18, 1000 Å), the EBL (100 Å), the EML(host (98 wt %) and dopant (2 wt %), 200 Å), the HBL (100 Å), the EIL(Formula 17 (98 wt %) and Li (2 wt %), 200 Å) and the cathode (Al, 500Å) was sequentially deposited to form the OLED.

1. COMPARATIVE EXAMPLES (1) Comparative Example 9 (Ref9)

The compound of Formula 19 is used to form the EBL, the compound“Dopant56” in Formula 6-1 is used as the dopant, the compound “Host2” inFormula 2 is used as the host, and the compound “E1” in Formula 10 isused to form the HBL.

(2) Comparative Example 10 (Ref10)

The compound “H3” in Formula 8 is used instead of the compound ofFormula 19 in Comparative Example 9.

(3) Comparative Example 11 (Ref11)

The compound “F1” in Formula 12 is used instead of the compound “E1” inFormula 10 in Comparative Example 9.

(4) Comparative Example 12 (Ref12)

The compound “F1” in Formula 12 is used instead of the compound “E1” inFormula 10 in Comparative Example 10.

(5) Comparative Examples 13 to 16 (Ref13 to Ref16)

The compound “Dopant167” in Formula 6-1 is used instead of the compound“Dopant56” in Comparative Examples 9 to 12.

(6) Comparative Examples 17 to 20 (Ref17 to Ref20)

The compound “Host4” in Formula 2 is used instead of the compound“Host2” in Comparative Examples 9 to 12.

(7) Comparative Examples 21 to 24 (Ref21 to Ref24)

The compound “Host4” in Formula 2 is used instead of the compound“Host2” in Comparative Examples 13 to 16.

2. EXAMPLES (1) Example 21 (Ex21)

The compound “H3” of Formula 8 is used to form the EBL, the compound“Dopant56” in Formula 6-1 is used as the dopant, the compound “Host2”and the compound “Host32” are used as the host, and the compound “E1” inFormula 10 is used to form the HBL. (“Host2”:“Host32”=3:7 (wt % ratio))

(2) Example 22 (Ex22)

The compound “F1” in Formula 12 is used instead of the compound “E1” inFormula 10 in Comparative Example 21.

(3) Example 23 (Ex23)

The compound “Dopant167” in Formula 6-1 is used instead of the compound“Dopant56” in Comparative Example 21.

(4) Example 24 (Ex24)

The compound “Dopant167” in Formula 6-1 is used instead of the compound“Dopant56” in Comparative Example 22.

(5) Example 25 (Ex25)

The compound “H3” of Formula 8 is used to form the EBL, the compound“Dopant56” in Formula 6-1 is used as the dopant, the compound “Host4”and the compound “Host34” are used as the host, and the compound “E1” inFormula 10 is used to form the HBL. (“Host4”:“Host34”=3:7 (wt % ratio))

(6) Example 26 (Ex26)

The compound “F1” in Formula 12 is used instead of the compound “E1” inFormula 10 in Comparative Example 25.

(7) Example 27 (Ex27)

The compound “Dopant167” in Formula 6-1 is used instead of the compound“Dopant56” in Comparative Example 25.

(8) Example 28 (Ex28)

The compound “Dopant167” in Formula 6-1 is used instead of the compound“Dopant56” in Comparative Example 26.

The properties, i.e., voltage (V), efficiency (Cd/A), color coordinate(CIE), FWHM and lifespan (T95), of the OLEDs manufactured in ComparativeExamples 9 to 24 and Examples 21 to 28 are measured and listed in Tables5 and 6.

TABLE 5 Host ratio 1st 2nd CIE T95 host host V Cd/A x y [hr] Ref9 10 03.77 4.70 0.1390 0.0612 45 Ref10 10 0 3.68 4.75 0.139 0.0614 232 Ex21  37 3.68 4.65 0.1410 0.0564 418 Ref11 10 0 3.47 5.00 0.1420 0.0562 20Ref12 10 0 3.38 5.05 0.1420 0.0564 104 Ex22  3 7 3.38 4.95 0.1440 0.0514188 Ref13 10 0 3.92 4.90 0.1378 0.1212 41 Ref14 10 0 3.83 4.95 0.13780.1214 213 Ex23  3 7 3.83 4.85 0.1398 0.1164 383 Ref15 10 0 3.62 5.200.1408 0.1162 18 Ref16 10 0 3.53 5.25 0.1408 0.1164 96 Ex24  3 7 3.535.15 0.1428 0.1114 172

TABLE 6 Host ratio 1st 2nd CIE T95 host host V Cd/A x y [hr] Ref17 10 03.94 4.62 0.1389 0.0609 41 Ref18 10 0 3.85 4.67 0.1389 0.0612 211 Ex25 3 7 3.85 4.57 0.1409 0.0562 380 Ref19 10 0 3.64 4.92 0.1419 0.0559 18Ref20 10 0 3.55 4.97 0.1419 0.0562 95 Ex26  3 7 3.55 4.87 0.1439 0.0512171 Ref21 10 0 4.09 4.82 0.1377 0.1209 38 Ref22 10 0 4.00 4.87 0.13770.1212 194 Ex27  3 7 4.00 4.77 0.1397 0.1162 349 Ref23 10 0 3.79 5.120.1407 0.1159 17 Ref24 10 0 3.70 5.17 0.1407 0.1162 87 Ex28  3 7 3.705.07 0.1427 0.1112 157

As shown in Tables 5 and 6, in comparison to the OLED in ComparativeExamples 9, 11, 13, 15, 17, 19, 21 and 23, the properties of the drivingvoltage, the emitting efficiency and the lifespan of the OLED inComparative Examples 10, 12, 14, 16, 18, 20, 22 and 24, where the EBLincludes the amine derivative of Formula 7, and the HBL includes theazine derivative of Formula 9 or the benzimidazole derivative of Formula11, are improved.

In addition, when the EML of the OLED includes the first host of Formula1, which is an anthracene derivative, and the second host of Formula 3,which is an anthracene derivative substituted with deuterium, asExamples 25 to 28, the emitting efficiency and the lifespan are furtherimproved.

[Organic Light Emitting Diode]

The anode (ITO, 50 Å), the HIL (Formula 18 (97 wt %) and Formula 14 (3wt %), 100 Å), the HTL (Formula 18, 900 Å), the EBL (100 Å), the EML(host (98 wt %) and dopant (2 wt %), 250 Å), the HBL (300 Å), the EIL(LiF, 10 Å) and the cathode (Al, 500 Å) was sequentially deposited toform the OLED.

1. COMPARATIVE EXAMPLES (1) Comparative Example 25 (Ref25)

The compound of Formula 19 is used to form the EBL, the compound“Dopant56” in Formula 6-1 is used as the dopant, the compound “Host2” inFormula 2 is used as the host, and the compound “E16” in Formula 10 andthe compound “F1” in Formula 12 are used to form the HBL.(“E16”:“F1”=1:1 (wt % ratio))

(2) Comparative Example 26 (Ref26)

The compound of Formula 20 is used instead of the compound of Formula 19in Comparative Example 25.

(3) Comparative Example 27 (Ref27)

The compound “H3” in Formula 8 is used instead of the compound ofFormula 19 in Comparative Example 25.

(4) Comparative Example 28 (Ref28)

The compound of Formula 19 is used to form the EBL, the compound“Dopant56” in Formula 6-1 is used as the dopant, the compound “Host4” inFormula 2 is used as the host, and the compound “E16” in Formula 10 andthe compound “F1” in Formula 12 are used to form the HBL.(“E16”:“F1”=1:1 (wt % ratio))

(5) Comparative Example 29 (Ref29)

The compound of Formula 20 is used instead of the compound of Formula 19in Comparative Example 28.

(6) Comparative Example 30 (Ref30)

The compound “H3” in Formula 8 is used instead of the compound ofFormula 19 in Comparative Example 28.

2. Examples (1) Example 29

The compound “H3” of Formula 8 is used to form the EBL, the compound“Dopant56” in Formula 6-1 is used as the dopant, the compound “Host2”and the compound “Host32” are used as the host, and the compound “E16”in Formula 10 and the compound “F1” in Formula 12 are used to form theHBL. (“Host2”:“Host32”=3:7 (wt % ratio), “E16”:“F1”=1:1 (wt % ratio))

(2) Example 30

The compound “H3” of Formula 8 is used to form the EBL, the compound“Dopant56” in Formula 6-1 is used as the dopant, the compound “Host4”and the compound “Host34” are used as the host, and the compound “E16”in Formula 10 and the compound “F1” in Formula 12 are used to form theHBL. (“Host4”:“Host34”=3:7 (wt % ratio), “E16”:“F1”=1:1 (wt % ratio))

The properties, i.e., voltage (V), efficiency (Cd/A), color coordinate(CIE), FWHM and lifespan (T95), of the OLEDs manufactured in ComparativeExamples 25 to 30 and Examples 29 and 30 are measured and listed inTable 7.

TABLE 7 Host ratio 1st 2nd CIE T95 host host V Cd/A x y [hr] Ref25 10 03.67 4.94 0.1420 0.0600 44 Ref26 10 0 3.55 4.76 0.1362 0.0606 31 Ref2710 0 3.58 4.99 0.1360 0.0602 227 Ex29  3 7 3.58 4.89 0.1380 0.0552 409Ref28 10 0 3.84 4.86 0.1430 0.0630 40 Ref29 10 0 3.72 4.68 0.1352 0.063628 Ref30 10 0 3.75 4.91 0.1350 0.0632 207 Ex30  3 7 3.75 4.81 0.13700.0582 373

As shown in Table 7, in comparison to the OLED in Comparative Examples25, 26, 28 and 29, the emitting efficiency of the OLED in ComparativeExamples 27 and 30 is improved, and the lifespan of the OLED inComparative Examples 27 and 30 is significantly increased.

In addition, when the EML of the OLED includes the first host of Formula1, which is an anthracene derivative, and the second host of Formula 3,which is an anthracene derivative substituted with deuterium, asExamples 29 and 30, the emitting efficiency and the lifespan are furtherimproved.

FIG. 4 is a schematic cross-sectional view illustrating an OLED having atandem structure of two emitting units according to the first embodimentof the present disclosure.

As shown in FIG. 4, the OLED D includes the first and second electrodes160 and 164 facing each other and the organic emitting layer 162 betweenthe first and second electrodes 160 and 164. The organic emitting layer162 includes a first emitting part 310 including a first EML 320, asecond emitting part 330 including a second EML 340 and a chargegeneration layer (CGL) 350 between the first and second emitting parts310 and 330.

The first electrode 160 may be formed of a conductive material having arelatively high work function to serve as an anode for injecting a holeinto the organic emitting layer 162. The second electrode 164 may beformed of a conductive material having a relatively low work function toserve as a cathode for injecting an electron into the organic emittinglayer 162.

The CGL 350 is positioned between the first and second emitting parts310 and 330, and the first emitting part 310, the CGL 350 and the secondemitting part 330 are sequentially stacked on the first electrode 160.Namely, the first emitting part 310 is positioned between the firstelectrode 160 and the CGL 350, and the second emitting part 320 ispositioned between the second electrode 160 and the CGL 350.

The first emitting part 310 includes a first EML 320, a first EBL 316between the first electrode 160 and the first EML 320 and a first HBLbetween the first EML 320 and the CGL 350.

In addition, the first emitting part 310 may further include a first HTL314 between the first electrode 160 and the first EBL 316 and an HIL 312between the first electrode 160 and the first HTL 314.

The first EML 320 includes a first host 322, which is an anthracenederivative, a second host 324, which is a deuterated anthracenederivative, and a blue dopant (not shown) such that blue light isprovided from the first EML 320.

Namely, the first EML 320 may include the compound of Formula 1 as thefirst host 322, the compound of Formula 3 as the second host 324 and thecompound of Formula 5-1 or Formula 5-2 as the blue dopant.

In the first EML 320, a weight % ratio of the first host 322 to thesecond host 324 may be about 1:9 to about 9:1, preferably about 1:9 toabout 7:3. To provide sufficient emitting efficiency and lifespan of theOLED D and the organic light emitting display device, the weight % ratioof the first host 322 to the second host 324 may be about 3:7. On theother hand, to increase the lifespan without decrease of the emittingefficiency, the weight % ratio of the first host 322 to the second host324 may be about 7:3.

The first EBL 316 may include an electron blocking material of Formula7. The first HBL 318 may include at least one of a hole blockingmaterial of Formula 9 and a hole blocking material of Formula 11.

The second emitting part 330 includes the second EML 340, a second EBL334 between the CGL 350 and the second EML 340 and a second HBL 336between the second EML 340 and the second electrode 164.

In addition, the second emitting part 330 may further include a secondHTL 332 between the CGL 350 and the second EBL 334 and an EIL 338between the second HBL 336 and the second electrode 164.

The second EML 340 includes a first host 342, which is an anthracenederivative, a second host 344, which is a deuterated anthracenederivative, and a blue dopant (not shown) such that blue light isprovided from the second EML 340.

Namely, the second EML 340 may include the compound of Formula 1 as thefirst host 342, the compound of Formula 3 as the second host 344 and thecompound of Formula 5-1 or Formula 5-2 as the blue dopant.

In the second EML 340, a weight % ratio of the first host 342 to thesecond host 344 may be about 1:9 to about 9:1, preferably about 1:9 toabout 7:3. To provide sufficient emitting efficiency and lifespan of theOLED D and the organic light emitting display device, the weight % ratioof the first host 342 to the second host 344 may be about 3:7. On theother hand, to increase the lifespan without decrease of the emittingefficiency, the weight % ratio of the first host 342 to the second host344 may be about 7:3.

The first host 342 of the second EML 340 may be same as or differentfrom the first host 322 of the first EML 320, and the second host 344 ofthe second EML 340 may be same as or different from the second host 324of the first EML 320. In addition, the blue dopant of the second EML 340may be same as or different from the blue dopant of the first EML 320.

The second EBL 334 may include an electron blocking material of Formula7. The second HBL 336 may include at least one of a hole blockingmaterial of Formula 9 and a hole blocking material of Formula 11.

The CGL 350 is positioned between the first and second emitting parts310 and 330. Namely, the first and second emitting parts 310 and 330 areconnected through the CGL 350. The CGL 350 may be a P-N junction CGL ofan N-type CGL 352 and a P-type CGL 354.

The N-type CGL 352 is positioned between the first HBL 318 and thesecond HTL 332, and the P-type CGL 354 is positioned between the N-typeCGL 352 and the second HTL 332.

In the OLED D, since each of the first and second EMLs 320 and 340includes the first host 322 and 342, each of which is an anthracenederivative, and the second host 324 and 344, each of which is adeuterated anthracene derivative, the OLED D and the organic lightemitting display device 100 have advantages in the emitting efficiencyand the lifespan.

In addition, at least one of the first and second EBLs 316 and 334includes an amine derivative of Formula 7, and at least one of the firstand second HBLs 318 and 336 includes at least one of a hole blockingmaterial of Formula 9 and a hole blocking material of Formula 11. As aresult, the lifespan of the OLED D and the organic light emittingdisplay device 100 is further improved.

Moreover, since the first and second emitting parts 310 and 330 foremitting blue light are stacked, the organic light emitting displaydevice 100 provides an image having high color temperature.

FIG. 5 is a schematic cross-sectional view illustrating an organic lightemitting display device according to a second embodiment of the presentdisclosure, and FIG. 6 is a schematic cross-sectional view illustratingan OLED for the organic light emitting display device according to thesecond embodiment of the present disclosure.

As shown in FIG. 5, the organic light emitting display device 400includes a first substrate 410, where a red pixel BP, a green pixel GPand a blue pixel BP are defined, a second substrate 470 facing the firstsubstrate 410, an OLED D, which is positioned between the first andsecond substrates 410 and 470 and providing white emission, and a colorfilter layer 480 between the OLED D and the second substrate 470.

Each of the first and second substrates 410 and 470 may be a glasssubstrate or a plastic substrate. For example, each of the first andsecond substrates 410 and 470 may be a polyimide substrate.

A buffer layer 420 is formed on the substrate, and the TFT Trcorresponding to each of the red, green and blue pixels RP, GP and BP isformed on the buffer layer 420. The buffer layer 420 may be omitted.

A semiconductor layer 422 is formed on the buffer layer 420. Thesemiconductor layer 122 may include an oxide semiconductor material orpolycrystalline silicon.

A gate insulating layer 424 is formed on the semiconductor layer 422.The gate insulating layer 424 may be formed of an inorganic insulatingmaterial such as silicon oxide or silicon nitride.

A gate electrode 430, which is formed of a conductive material, e.g.,metal, is formed on the gate insulating layer 424 to correspond to acenter of the semiconductor layer 422.

An interlayer insulating layer 432, which is formed of an insulatingmaterial, is formed on the gate electrode 430. The interlayer insulatinglayer 432 may be formed of an inorganic insulating material, e.g.,silicon oxide or silicon nitride, or an organic insulating material,e.g., benzocyclobutene or photo-acryl.

The interlayer insulating layer 432 includes first and second contactholes 434 and 436 exposing both sides of the semiconductor layer 422.The first and second contact holes 434 and 436 are positioned at bothsides of the gate electrode 430 to be spaced apart from the gateelectrode 430.

A source electrode 440 and a drain electrode 442, which are formed of aconductive material, e.g., metal, are formed on the interlayerinsulating layer 432.

The source electrode 440 and the drain electrode 442 are spaced apartfrom each other with respect to the gate electrode 430 and respectivelycontact both sides of the semiconductor layer 422 through the first andsecond contact holes 434 and 436.

The semiconductor layer 422, the gate electrode 430, the sourceelectrode 440 and the drain electrode 442 constitute the TFT Tr. The TFTTr serves as a driving element. Namely, the TFT Tr may correspond to thedriving TFT Td (of FIG. 1).

Although not shown, the gate line and the data line cross each other todefine the pixel, and the switching TFT is formed to be connected to thegate and data lines. The switching TFT is connected to the TFT Tr as thedriving element.

In addition, the power line, which may be formed to be parallel to andspaced apart from one of the gate and data lines, and the storagecapacitor for maintaining the voltage of the gate electrode of the TFTTr in one frame may be further formed.

A passivation layer 450, which includes a drain contact hole 452exposing the drain electrode 442 of the TFT Tr, is formed to cover theTFT Tr.

A first electrode 460, which is connected to the drain electrode 442 ofthe TFT Tr through the drain contact hole 452, is separately formed ineach pixel. The first electrode 160 may be an anode and may be formed ofa conductive material having a relatively high work function. Forexample, the first electrode 460 may be formed of a transparentconductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide(IZO).

A reflection electrode or a reflection layer may be formed under thefirst electrode 460. For example, the reflection electrode or thereflection layer may be formed of aluminum-palladium-copper (APC) alloy.

A bank layer 466 is formed on the passivation layer 450 to cover an edgeof the first electrode 460. Namely, the bank layer 466 is positioned ata boundary of the pixel and exposes a center of the first electrode 460in the red, green and blue pixels RP, GP and BP. The bank layer 466 maybe omitted.

An organic emitting layer 462 is formed on the first electrode 460.

Referring to FIG. 6, the organic emitting layer 462 includes a firstemitting part 530 including a first EML 520, a second emitting part 550including a second EML 540, a third emitting part 570 including a thirdEML 560, a first CGL 580 between the first and second emitting parts 530and 550 and a second CGL 590 between the second and third emitting parts550 and 570.

The first electrode 460 may be formed of a conductive material having arelatively high work function to serve as an anode for injecting a holeinto the organic emitting layer 462. The second electrode 464 may beformed of a conductive material having a relatively low work function toserve as a cathode for injecting an electron into the organic emittinglayer 462.

The first CGL 580 is positioned between the first and second emittingparts 530 and 550, and the second CGL 590 is positioned between thesecond and third emitting parts 550 and 570. Namely, the first emittingpart 530, the first CGL 580, the second emitting part 550, the secondCGL 590 and the third emitting part 570 are sequentially stacked on thefirst electrode 460. In other words, the first emitting part 530 ispositioned between the first electrode 460 and the first CGL 570, thesecond emitting part 550 is positioned between the first and second CGLs580 and 590, and the third emitting part 570 is positioned between thesecond electrode 460 and the second CGL 590.

The first emitting part 530 may include an HIL 532, a first HTL 534, afirst EBL 536, the first EML 520 and a first HBL 538 sequentiallystacked on the first electrode 460. Namely, the HIL 532, the first HTL534 and the first EBL 536 are positioned between the first electrode 460and the first EML 520, and the first HBL 538 is positioned between thefirst EML 520 and the first CGL 580.

The first EML 520 includes a first host 522, which is an anthracenederivative, a second host 524, which is a deuterated anthracenederivative, and a blue dopant (not shown) such that blue light isprovided from the first EML 520.

Namely, the first EML 520 may include the compound of Formula 1 as thefirst host 522, the compound of Formula 3 as the second host 524 and thecompound of Formula 5-1 or Formula 5-2 as the blue dopant.

In the first EML 520, a weight % ratio of the first host 522 to thesecond host 524 may be about 1:9 to about 9:1, preferably about 1:9 toabout 7:3. To provide sufficient emitting efficiency and lifespan of theOLED D and the organic light emitting display device, the weight % ratioof the first host 522 to the second host 524 may be about 3:7. On theother hand, to increase the lifespan without decrease of the emittingefficiency, the weight % ratio of the first host 522 to the second host524 may be about 7:3.

The first EBL 536 may include an electron blocking material of Formula7. The first HBL 538 may include at least one of a hole blockingmaterial of Formula 9 and a hole blocking material of Formula 11.

The second EML 550 may include a second HTL 552, the second EML 540 andan electron transporting layer (ETL) 554. The second HTL 552 ispositioned between the first CGL 580 and the second EML 540, and the ETL554 is positioned between the second EML 540 and the second CGL 590.

The second EML 540 may be a yellow-green EML. For example, the secondEML 540 may include a host and a yellow-green dopant. Alternatively, thesecond EML 540 may include a host, a red dopant and a green dopant. Inthis instance, the second EML 540 may include a lower layer includingthe host and the red dopant (or the green dopant) and an upper layerincluding the host and the green dopant (or the red dopant).

The third emitting part 570 may include a third HTL 572, a second EBL574, the third EML 560, a second HBL 576 and an EIL 578. The third EML560 (or the third emitting part 570) includes a first host 562, which isan anthracene derivative, a second host 564, which is a deuteratedanthracene derivative, and a blue dopant (not shown) such that bluelight is provided from the third EML 560. Namely, the third EML 560 mayinclude the compound of Formula 1 as the first host 562, the compound ofFormula 3 as the second host 564 and the compound of Formula 5-1 orFormula 5-2 as the blue dopant.

In the third EML 560, a weight % ratio of the first host 562 to thesecond host 564 may be about 1:9 to about 9:1, preferably about 1:9 toabout 7:3. To provide sufficient emitting efficiency and lifespan of theOLED D and the organic light emitting display device, the weight % ratioof the first host 562 to the second host 564 may be about 3:7. On theother hand, to increase the lifespan without decrease of the emittingefficiency, the weight % ratio of the first host 562 to the second host564 may be about 7:3.

The first host 562 of the third EML 560 may be same as or different fromthe first host 522 of the first EML 520, and the second host 564 of thethird EML 560 may be same as or different from the second host 524 ofthe first EML 520. In addition, the blue dopant of the third EML 560 maybe same as or different from the blue dopant of the first EML 520.

The second EBL 574 may include an electron blocking material of Formula7. The second HBL 576 may include at least one of a hole blockingmaterial of Formula 9 and a hole blocking material of Formula 11. Theelectron blocking material of the second EBL 574 may be same as ordifferent from the electron blocking material of the first EBL 536, andthe hole blocking material of the second HBL 576 may be same as ordifferent from the hole blocking material of the first HBL 538.

The first CGL 580 is positioned between the first emitting part 530 andthe second emitting part 550, and the second CGL 590 is positionedbetween the second emitting part 550 and the third emitting part 570.Namely, the first and second emitting stacks 530 and 550 are connectedthrough the first CGL 580, and the second and third emitting stacks 550and 570 are connected through the second CGL 590. The first CGL 580 maybe a P-N junction CGL of a first N-type CGL 582 and a first P-type CGL584, and the second CGL 590 may be a P-N junction CGL of a second N-typeCGL 592 and a second P-type CGL 594.

In the first CGL 580, the first N-type CGL 582 is positioned between thefirst HBL 538 and the second HTL 552, and the first P-type CGL 584 ispositioned between the first N-type CGL 582 and the second HTL 552.

In the second CGL 590, the second N-type CGL 592 is positioned betweenthe ETL 554 and the third HTL 572, and the second P-type CGL 594 ispositioned between the second N-type CGL 592 and the third HTL 572.

In the OLED D, since each of the first and third EMLs 520 and 560includes the first host 522 and 562, each of which is an anthracenederivative, the second host 524 and 564, each of which is a deuteratedanthracene derivative, and the blue dopant.

Accordingly, the OLED D including the first and third emitting parts 530and 570 with the second emitting part 550, which emits yellow-greenlight or red/green light, can emit white light.

In FIG. 6, the OLED D has a triple-stack structure of the first, secondand third emitting parts 530, 550 and 570. Alternatively, the OLED D mayhave a double-stack structure without the first emitting part 530 andthe third emitting part 570.

Referring to FIG. 5 again, a second electrode 464 is formed over thesubstrate 110 where the organic emitting layer 162 is formed.

In the organic light emitting display device 400, since the lightemitted from the organic emitting layer 462 is incident to the colorfilter layer 480 through the second electrode 464, the second electrode464 has a thin profile for transmitting the light.

The first electrode 460, the organic emitting layer 462 and the secondelectrode 464 constitute the OLED D.

The color filter layer 480 is positioned over the OLED D and includes ared color filter 482, a green color filter 484 and a blue color filter486 respectively corresponding to the red, green and blue pixels RP, GPand BP.

Although not shown, the color filter layer 480 may be attached to theOLED D by using an adhesive layer. Alternatively, the color filter layer480 may be formed directly on the OLED D.

An encapsulation film (not shown) may be formed to prevent penetrationof moisture into the OLED D. For example, the encapsulation film mayinclude a first inorganic insulating layer, an organic insulating layerand a second inorganic insulating layer sequentially stacked, but it isnot limited thereto. The encapsulation film may be omitted.

A polarization plate (not shown) for reducing an ambient lightreflection may be disposed over the top-emission type OLED D. Forexample, the polarization plate may be a circular polarization plate.

In FIG. 5, the light from the OLED D passes through the second electrode464, and the color filter layer 480 is disposed on or over the OLED D.Alternatively, when the light from the OLED D passes through the firstelectrode 460, the color filter layer 480 may be disposed between theOLED D and the first substrate 410.

A color conversion layer (not shown) may be formed between the OLED Dand the color filter layer 480. The color conversion layer may include ared color conversion layer, a green color conversion layer and a bluecolor conversion layer respectively corresponding to the red, green andblue pixels RP, GP and BP. The white light from the OLED D is convertedinto the red light, the green light and the blue light by the red, greenand blue color conversion layer, respectively.

As described above, the white light from the organic light emittingdiode D passes through the red color filter 482, the green color filter484 and the blue color filter 486 in the red pixel RP, the green pixelGP and the blue pixel BP such that the red light, the green light andthe blue light are provided from the red pixel RP, the green pixel GPand the blue pixel BP, respectively.

In FIGS. 5 and 6, the OLED D emitting the white light is used for adisplay device.

Alternatively, the OLED D may be formed on an entire surface of asubstrate without at least one of the driving element and the colorfilter layer to be used for a lightening device. The display device andthe lightening device each including the OLED D of the presentdisclosure may be referred to as an organic light emitting device.

FIG. 7 is a schematic cross-sectional view illustrating an organic lightemitting display device according to a third embodiment of the presentdisclosure.

As shown in FIG. 7, the organic light emitting display device 600includes a first substrate 610, where a red pixel BP, a green pixel GPand a blue pixel BP are defined, a second substrate 670 facing the firstsubstrate 610, an OLED D, which is positioned between the first andsecond substrates 610 and 670 and providing white emission, and a colorconversion layer 680 between the OLED D and the second substrate 470.

Although not shown, a color filter may be formed between the secondsubstrate 670 and each color conversion layer 680.

A TFT Tr, which corresponding to each of the red, green and blue pixelsRP, GP and BP, is formed on the first substrate 610, and a passivationlayer 650, which has a drain contact hole 652 exposing an electrode,e.g., a drain electrode, of the TFT Tr is formed to cover the TFT Tr.

The OLED D including a first electrode 660, an organic emitting layer662 and a second electrode 664 is formed on the passivation layer 650.In this instance, the first electrode 660 may be connected to the drainelectrode of the TFT Tr through the drain contact hole 652.

An bank layer 666 covering an edge of the first electrode 660 is formedat a boundary of the red, green and blue pixel regions RP, GP and BP.

The OLED D emits a blue light and may have a structure shown in FIG. 3or FIG. 4. Namely, the OLED D is formed in each of the red, green andblue pixels RP, GP and BP and provides the blue light.

The color conversion layer 680 includes a first color conversion layer682 corresponding to the red pixel RP and a second color conversionlayer 684 corresponding to the green pixel GP. For example, the colorconversion layer 680 may include an inorganic color conversion materialsuch as a quantum dot.

The blue light from the OLED D is converted into the red light by thefirst color conversion layer 682 in the red pixel RP, and the blue lightfrom the OLED D is converted into the green light by the second colorconversion layer 684 in the green pixel GP.

Accordingly, the organic light emitting display device 600 can display afull-color image.

On the other hand, when the light from the OLED D passes through thefirst substrate 610, the color conversion layer 680 is disposed betweenthe OLED D and the first substrate 610.

While the present disclosure has been described with reference toexemplary embodiments and examples, these embodiments and examples arenot intended to limit the scope of the present disclosure. Rather, itwill be apparent to those skilled in the art that various modificationsand variations can be made in the present disclosure without departingfrom the spirit or scope of the invention. Thus, it is intended that thepresent disclosure cover the modifications and variations of the presentdisclosure provided they come within the scope of the appended claimsand their equivalents.

The various embodiments described above can be combined to providefurther embodiments. All of patents, patent application publications,patent applications, foreign patents, foreign patent applications andnon-patent publications referred to in this specification and/or listedin the Application Data Sheet are incorporated herein by reference, intheir entirety. Aspects of the embodiments can be modified, if necessaryto employ concepts of the various patents, applications and publicationsto provide yet further embodiments.

These and other changes can be made to the embodiments in light of theabove-detailed description. In general, in the following claims, theterms used should not be construed to limit the claims to the specificembodiments disclosed in the specification and the claims, but should beconstrued to include all possible embodiments along with the full scopeof equivalents to which such claims are entitled. Accordingly, theclaims are not limited by the disclosure.

1. An organic light emitting diode (OLED), comprising: a firstelectrode; a second electrode facing the first electrode; a firstemitting material layer including a first host, a second host and a bluedopant and positioned between the first and second electrodes; a firstelectron blocking layer including an electron blocking material of anamine derivative and positioned between the first electrode and thefirst emitting material layer; and a first hole blocking layer includingat least one of a first hole blocking material and a second holeblocking material and positioned between the second electrode and thefirst emitting material layer, wherein the first host is an anthracenederivative, and the second host is a deuterated anthracene derivative,and wherein the first hole blocking material is an azine derivative, andthe second hole blocking material is a benzimidazole derivative.
 2. TheOLED of claim 1, wherein the first host is represented by Formula 1:

wherein each of R₁ and R₂ is independently C₆˜C₃₀ aryl group or C₅˜C₃₀heteroaryl group, and each of L₁ and L₂ is independently C₆˜C₃₀ arylenegroup. Each of a and b is an integer of 0 or 1, and at least one of aand b is
 0. 3. The OLED of claim 2, wherein the first host is a compoundbeing one of the followings of Formula 2:


4. The OLED of claim 2, wherein the second host is represented byFormula 3:

wherein the definition of R₁, R₂, L₁, L₂, a and be is same as Formula 1,and wherein each of x, y, m and n is independently a positive integer,and a summation of x, y, m and n may be 15 to
 29. 5. The OLED of one ofclaim 1, wherein the second host is a compound in which all or part ofhydrogen of the first host is substituted with deuterium.
 6. The OLED ofclaim 1, wherein a weight % ratio of the first host to the second hostis 1:9 to 9:1.
 7. The OLED of claim 6, wherein the weight % ratio of thefirst host to the second host is 1:9 to 7:3.
 8. The OLED of claim 6,wherein the weight % ratio of the first host to the second host is 3:7.9. The OLED of claim 6, wherein the weight % ratio of the first host tothe second host is 7:3.
 10. The OLED of claim 1, wherein the blue dopantis represented by Formula 4 or Formula 5:

wherein in Formula 4, each of c and d is independently an integer of 0to 4, and e is an integer of 0 to 3, wherein each of R₁₁ and R₁₂ isindependently selected from the group consisting of C₁˜C₂₀ alkyl group,C₆˜C₃₀ aryl group, C₅˜C₃₀ hetero aryl group and C₆˜C₃₀ aryl amino group,or adjacent two among R₁₁ or adjacent two among R₁₂ form a fusedaromatic ring or a hetero-aromatic ring, wherein R₁₃ is selected fromthe group consisting of C₁˜C₁₀ alkyl group, C₆˜C₃₀ aryl group, C₅˜C₃₀hetero aryl group and C₅˜C₃₀ aromatic amino group, wherein each of X₁and X₂ is independently oxygen (O) or NR₁₄, and R₁₄ is C₆˜C₃₀ arylgroup, and wherein in Formula 5, each of Ar₁, Ar₂, Ar₃ and Ar₄ isindependently selected from the group consisting of C₆˜C₃₀ aryl groupand C₅˜C₃₀ hetero aryl group, and each of R₁ and R₂ is independentlyselected from the group consisting of hydrogen, C₁˜C₂₀ alkyl group andC₆˜C₃₀ aryl group.
 11. The OLED of claim 1, wherein the electronblocking material is represented by Formula 6:

wherein each of R₁, R₂, R₃ and R₄ is independently selected from thegroup consisting of monocyclic aryl group or polycyclic aryl group, andat least one of R₁, R₂, R₃ and R₄ is polycyclic aryl group.
 12. The OLEDof claim 11, wherein the electron blocking material is a compound beingone of the followings of Formula 7:


13. The OLED of claim 1, wherein the first hole blocking material isrepresented by Formula 8:

wherein each of Y₁ to Y₅ are independently CR₁ or N, and one to three ofY₁ to Y₅ is N, wherein R₁ is independently hydrogen or C₆˜C₃₀ arylgroup, wherein L is C₆˜C₃₀ arylene group, and R₂ is C₆˜C₃₀ aryl group orC₅˜C₃₀ hetero aryl group, wherein R₃ is hydrogen, or adjacent two of R₃form a fused ring, and wherein “a” is 0 or 1, “b” is 1 or 2, and “c” isan integer of 0 to
 4. 14. The OLED of claim 13, wherein the first holeblocking material is a compound being one of the followings of Formula9:


15. The OLED of claim 1, wherein the second hole blocking material isrepresented by Formula 10:

wherein Ar is C₁₀˜C₃₀ arylene group, R₁ is C₆˜C₃₀ aryl group or C₅˜C₃₀hetero aryl group, and wherein R₂ is C₁˜C₁₀ alkyl group or C₆˜C₃₀ arylgroup.
 16. The OLED of claim 15, wherein the second hole blockingmaterial is a compound being one of the followings of Formula 11:


17. The OLED of claim 1, further comprising: a second emitting materiallayer including the first host, the second host and the blue dopant andpositioned between the first emitting material layer and the secondelectrode; and a first charge generation layer between the first andsecond emitting material layers.
 18. The OLED of claim 17, furthercomprising: a third emitting material layer emitting a yellow-greenlight and positioned between the first charge generation layer and thesecond emitting material layer; and a second charge generation layerbetween the second and third emitting material layers.
 19. The OLED ofclaim 17, further comprising: a third emitting material layer emitting ared light and a green light and positioned between the first chargegeneration layer and the second emitting material layer; and a secondcharge generation layer between the second and third emitting materiallayers.
 20. An organic light emitting device, comprising: a substrate;and an organic light emitting diode positioned on the substrate andincluding a first electrode; a second electrode facing the firstelectrode; a first emitting material layer including a first host, asecond host and a blue dopant and positioned between the first andsecond electrodes; a first electron blocking layer including an electronblocking material of an amine derivative and positioned between thefirst electrode and the first emitting material layer; and a first holeblocking layer including at least one of a first hole blocking materialand a second hole blocking material and positioned between the secondelectrode and the first emitting material layer, wherein the first hostis an anthracene derivative, and the second host is a deuteratedanthracene derivative, and wherein the first hole blocking material isan azine derivative, and the second hole blocking material is abenzimidazole derivative.
 21. The organic light emitting device of claim20, wherein the first host is represented by Formula 1:

wherein each of R₁ and R₂ is independently C₆˜C₃₀ aryl group or C₅˜C₃₀heteroaryl group, and each of L₁ and L₂ is independently C₆˜C₃₀ arylenegroup. Each of a and b is an integer of 0 or 1, and at least one of aand b is
 0. 22. The organic light emitting device of claim 21, whereinthe first host is a compound being one of the followings of Formula 2:


23. The organic light emitting device of claim 21, wherein the secondhost is represented by Formula 3:

wherein the definition of R₁, R₂, L₁, L₂, a and be is same as Formula 1,and wherein each of x, y, m and n is independently a positive integer,and a summation of x, y, m and n may be 15 to
 29. 24. The organic lightemitting device of one of claim 20, wherein the second host is acompound in which all or part of hydrogen of the first host issubstituted with deuterium.
 25. The organic light emitting device ofclaim 20, wherein a weight % ratio of the first host to the second hostis 1:9 to 9:1.
 26. The organic light emitting device of claim 25,wherein the weight % ratio of the first host to the second host is 1:9to 7:3.
 27. The organic light emitting device of claim 25, wherein theweight % ratio of the first host to the second host is 3:7.
 28. Theorganic light emitting device of claim 25, wherein the weight % ratio ofthe first host to the second host is 7:3.
 29. The organic light emittingdevice of claim 20, wherein the first blue dopant is represented byFormula 4 or Formula 5:

wherein in Formula 4, each of c and d is independently an integer of 0to 4, and e is an integer of 0 to 3, wherein each of R₁₁ and R₁₂ isindependently selected from the group consisting of C₁˜C₂₀ alkyl group,C₆˜C₃₀ aryl group, C₅˜C₃₀ hetero aryl group and C₆˜C₃₀ aryl amino group,or adjacent two among R₁₁ or adjacent two among R₁₂ form a fusedaromatic ring or a hetero-aromatic ring, wherein R₁₃ is selected fromthe group consisting of C₁˜C₁₀ alkyl group, C₆˜C₃₀ aryl group, C₅˜C₃₀hetero aryl group and C₅˜C₃₀ aromatic amino group, wherein each of X₁and X₂ is independently oxygen (O) or NR₁₄, and R₁₄ is C₆˜C₃₀ arylgroup, and wherein in Formula 5, each of Ar₁, Ar₂, Ar₃ and Ar₄ isindependently selected from the group consisting of C₆˜C₃₀ aryl groupand C₅˜C₃₀ hetero aryl group, and each of R₁ and R₂ is independentlyselected from the group consisting of hydrogen, C₁˜C₂₀ alkyl group andC₆˜C₃₀ aryl group.
 30. The organic light emitting device of claim 20,wherein the electron blocking material is represented by Formula 6:Formula 6, wherein each of R₁, R₂, R₃ and R₄ is independently selectedfrom the group consisting of monocyclic aryl group or polycyclic arylgroup, and at least one of R₁, R₂, R₃ and R₄ is polycyclic aryl group.31. The organic light emitting device of claim 30, wherein the electronblocking material is a compound being one of the followings of Formula7:


32. The organic light emitting device of claim 20, wherein the firsthole blocking material is represented by Formula 8:

wherein each of Y₁ to Y₅ are independently CR₁ or N, and one to three ofY₁ to Y₅ is N, wherein R₁ is independently hydrogen or C₆˜C₃₀ arylgroup, wherein L is C₆˜C₃₀ arylene group, and R₂ is C₆˜C₃₀ aryl group orC₅˜C₃₀ hetero aryl group, wherein R₃ is hydrogen, or adjacent two of R₃form a fused ring, and wherein “a” is 0 or 1, “b” is 1 or 2, and “c” isan integer of 0 to
 4. 33. The organic light emitting device of claim 32,wherein the first hole blocking material is a compound being one of thefollowings of Formula 9:


34. The organic light emitting device of claim 20, wherein the secondhole blocking material is represented by Formula 10:

wherein Ar is C₁₀˜C₃₀ arylene group, R₁ is C₆˜C₃₀ aryl group or C₅˜C₃₀hetero aryl group, and wherein R₂ is C₁˜C₁₀ alkyl group or C₆˜C₃₀ arylgroup.
 35. The organic light emitting device of claim 34, wherein thesecond hole blocking material is a compound being one of the followingsof Formula 11:


36. The organic light emitting device of claim 20, wherein the organiclight emitting diode further includes: a second emitting material layerincluding a third host, a fourth host and a second blue dopant andpositioned between the first emitting material layer and the secondelectrode; and a first charge generation layer between the first andsecond emitting material layers, wherein the third host is an anthracenederivative, and the fourth host is a deuterated anthracene derivative.37. The organic light emitting device of claim 20, wherein a red pixel,a green pixel and a blue pixel are defined on the substrate, and theorganic light emitting diode corresponds to each of the red, green andblue pixels, and wherein the organic light emitting device furtherincludes: a color conversion layer disposed between the substrate andthe organic light emitting diode or on the organic light emitting diodeand corresponding to the red and green pixels.
 38. The organic lightemitting device of claim 36, wherein the organic light emitting diodefurther includes: a third emitting material layer emitting ayellow-green light and positioned between the first charge generationlayer and the second emitting material layer; and a second chargegeneration layer between the second and third emitting material layers.39. The organic light emitting device of claim 36, wherein the organiclight emitting diode further includes: a third emitting material layeremitting a red light and a green light and positioned between the firstcharge generation layer and the second emitting material layer; and asecond charge generation layer between the second and third emittingmaterial layers.
 40. The organic light emitting device of claim 38,wherein a red pixel, a green pixel and a blue pixel are defined on thesubstrate, and the organic light emitting diode corresponds to each ofthe red, green and blue pixels, and wherein the organic light emittingdevice further includes: a color filter layer disposed between thesubstrate and the organic light emitting diode or on the organic lightemitting diode and corresponding to the red, green and blue pixels.